& 
By: 
os 
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ON RUBUS IDZXUS. 111 
times stronger, deflexed, and almost sufficient to wound (R. Ideus, L., 
yar. maritimus, Arrhen.), Still more do the leaves vary, being pinnate, 
times even on the under-side (2. /deus, var. viridis, fl. Frib. 
leaflets are for the most part ovate-lanceolate, but may also, when 
ternate, be roundly ovate, nearly orbicular. orm from Lapland 
,L., elongatus, Lest.) has elongated lanceolate leaflets. On the 
sea-coast of the East of Sweden there is a remarkable form, named 2. 
 maritimus by Arrhenius, in many respects different from 
the typical form; its leaflets are thick and plicate, like those of 2. 
fruticosus, L. What has now been said is enough to show that 2. - 
deus, L., is a very variable species, but that its variability is limited 
in this way, that no forms connecting it with the other species now 
living in Europe are produced by its means. 
glance at the influence which climate exercises on the 
production of forms in the genus Rubus also appears to show 
that R. Ideus, L., does not belong at all to the same type 
the other European species. In the North of Europe 
it i 
en. 
either hairy above or covered with stellate hairs, or glabrous, some- 
dis, fl. Frib.). The 
un 
glandular forms, produced by the influence of the oceanic climate; but 
these do not appear to be quite identical with the glandular forms of 
the East of Europe (comp. F. Areschoug, ‘‘ Om de Skandinaviska 
Rubus formerna af gruppen Corylifolii”” (‘‘ On the Scandinavian forms 
of the group Corylifolii’”) in Bot. Notiser, 1871, Nos. 5 and6). The 
forms ( lit) whose exterior organisation is best 
accommodated to the climate of the North of Europe, and which for 
that reason are prevalent in that region, are marked by glabrous 
stems, large, thin, and green leaves, and generally by their disposition 
be very few-flowered. Only when growing in places exposed to 
are t ound, for instance, in Sweden, probably migrated into 
that country after the already got their typical form. But 
these species have al manner been forced to accommodate them- 
green leayes, which are characteristic of Rubi from the North of 
irope, promote transpiration, { \ 
temperature, and in - humid atmosphere, the thick Wnaton oi 
leaves white-felted on the under-side, and covered with stellate hairs 
above, characteristics of the Rubs discolores and tomentos? prevailing 
in the South of Europe; but by the thinness and the large surface of 
eee fenth of Europe; but by (ta 
. ingto: i i not believe that 2. Ideus anomalus 
of Ache sagt gra pee » oo, Bab. As I have had an opportuni 
of seeing specimens of the form named by Arrhe I 
assert that these names are synonymous. 
